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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 21 |
| 5 | 43 |
| 6 | 88 |
| 7 | 177 |
| 8 | 356 |
| 9 | 714 |
| 10 | 1429 |
| 11 | 2860 |
| 12 | 5722 |
| 13 | 11445 |
| 14 | 22891 |
| 15 | 45784 |
| 16 | 91569 |
| 17 | 183139 |
| 18 | 366280 |
| 19 | 732562 |
| 20 | 1465125 |
| 21 | 2930252 |
| 22 | 5860505 |
| 23 | 11721011 |
| 24 | 23442024 |
| 25 | 46884049 |
| 26 | 93768100 |
| 27 | 187536202 |
| 28 | 375072405 |
| 29 | 750144811 |
| 30 | 1500289624 |
| 31 | 3000579249 |
| 32 | 6001158499 |
| 33 | 12002317000 |
[0,1,4,10,21,43,88,177,356,714,1429,2860,5722, 11445,22891,45784,91569,183139,366280,732562, 1465125,2930252,5860505,11721011,23442024, 46884049,93768100,187536202,375072405,750144811, 1500289624,3000579249,6001158499,12002317000] |